Could you please describe your application: a?zn>tx 1, is the emitting source single mode or multimode? what are the parameters i.e. divergence, waist, ... NF}QQwG3 2, is the fiber single mode or multimode? what is the NA, core dia,... jm-J_o;}z6 73-*|@6 Generally, fiber coupling efficiency of 40%~90% is reasonable. z/JoUje Q^&oXM'x/i Again let us know your specific bug. Vvth, pJ` M5pF MANG2004 "[PxLq5